Method for judging resistance encountering of electric lifting table by utilizing wavelet modulus maximum

A judging method and modulus maximum technology, applied in character and pattern recognition, instruments, computer parts, etc., can solve problems such as lack, difficulty in accurately identifying clamping conditions, and limitations

Pending Publication Date: 2020-07-03
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason is that due to cost constraints, the lifting table has no force detection sensor that can measure load changes, but still needs to rely...

Method used

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  • Method for judging resistance encountering of electric lifting table by utilizing wavelet modulus maximum
  • Method for judging resistance encountering of electric lifting table by utilizing wavelet modulus maximum
  • Method for judging resistance encountering of electric lifting table by utilizing wavelet modulus maximum

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Embodiment Construction

[0046] Electric lift table is the main form of electric lift table such as figure 1 Shown: as figure 1As shown, the mechanical structure of the automatic lifting table is divided into six parts: the desktop, the bracket, the connecting shaft, the motor controller, the column and the base. The desktop 1 is connected with the support 3 through the connecting shaft 2, and fixed by screws and bolts. The middle structure of the column 4 is nested by two connecting rods, the motor controller 5 controls the motor at the top of the column 4, and the synchronous control of multiple motors by the single-chip microcomputer as a whole realizes the highly precise lifting of the automatic lifting table. The column 4 is connected to the base 6 through a connecting shaft to provide stable support for the entire table.

[0047] In order to enhance the market competitiveness of the product, the motor current acquisition adopts the bus resistance sampling method, and the speed signal adopts th...

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Abstract

The invention discloses a method for judging resistance encountering of an electric lifting table by utilizing a wavelet modulus maximum value. The method comprises the following steps: (1) acquiringcurrent data of the electric lifting table under different working conditions; the method comprises the steps of (1) obtaining an original signal, (2) performing preprocessing of filtering high frequency and averaging on the original signal to obtain a preprocessed signal, (2) applying CWT to the preprocessed signal in the step (1) to obtain a wavelet coefficient, and (3) positioning a hand clamping moment or a hand clamping region by using gray scale images of the wavelet transform coefficient under different scales. Wherein when an obstacle is encountered, singularity can be generated alongwith the occurrence of the modulus maximum of the wavelet coefficient, so that an obvious stripe cone can be formed in the grayscale image of the wavelet transform coefficient, and (4) searching the wavelet modulus maximum in each scale within the influence range. Drawing a wavelet modulus maximum value line on the scale based on the found wavelet modulus maximum value point, wherein all points inthe line are wavelet transform modulus maximum values. By utilizing the method, the load condition can be effectively identified under each load condition.

Description

technical field [0001] The invention belongs to the field of electric lifting tables, and in particular relates to a method for judging resistance of electric lifting tables. Background technique [0002] With the development of society and economy, people continue to work in the office for longer and longer. According to the survey, office workers spend 1 / 2 to 2 / 3 of their time sitting in a sitting position. The fixed sitting position causes continuous pressure on the spine. cause pain and even deformity. Long-term sitting at a desk will lead to muscle atrophy, weakened mobility, slow blood flow, and easy to suffer from lumbar muscle strain, lumbar disc herniation and other lumbar diseases. Scientific research shows that only sitting and standing alternately is the scientific and healthy way of working. [0003] The electric lift table uses a motor to realize the automatic lifting of the desktop, which can adapt to people's requirements for different desktop heights, and ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06F2218/14G06F2218/06
Inventor 韦亚杰顾敏明武宪青潘海鹏
Owner ZHEJIANG SCI-TECH UNIV
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